Anritsu MG3641A - Manual (Page 13)

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Power Line Fuse Protection
For safety, Anritsu products have either one or two fuses in the AC power
lines as requested by the customer when ordering.
Single fuse: A fuse is inserted in one of the AC power lines.
Double fuse: A fuse is inserted in each of the AC power lines.
Example 1: An example of the single fuse is shown below:
Fuse Holder
Example 2: An example of the double fuse is shown below:
Fuse Holders